Does 5e have an item interaction?
I could really have some help in understanding how the item interactions work and how they are used during combat.
As part of your turn, you get to interact with one object for free:
Your turn can include a variety of flourishes that require neither your action nor your move.... You can also interact with one object or feature of the environment for free, during either your move or your action. For example, you could open a door during your move as you stride toward a foe, or you could draw your weapon as part of the same action you use to attack.
But a second object would require your action (see the next section of this answer):
If you want to interact with a second object, you need to use your action. Some magic items and other special objects always require an action to use, as stated in their descriptions.
If you need to interact with a second object, you can take the Use an Object action:
You normally interact with an object while doing something else, such as when you draw a sword as part of an attack. When an object requires your action for its use, you take the Use an Object action. This action is also useful when you want to interact with more than one object on your turn.
The 5th edition of D&D is a game of exceptions. For example, when you attack with a weapon requiring ammunition, drawing the ammunition is a part of making the attack (it doesn't use up the free object interaction mentioned above). There may be other such exceptions. If an object can be interacted with in an exceptional way, the rules for that object, one of your features, or a game option will mention it.